The invention provides a base connecting structure of a pumping unit. The base connecting structure of the pumping unit comprises a cement foundation of the pumping unit, embedded steel plates, foundation grooves and bolt holes. The embedded steel plates are arranged in the cement foundation of the pumping unit, and the upper surfaces of the embedded steel plates are lower than the upper surface of the cement foundation of the pumping unit. The foundation grooves are formed in the cement foundation of the pumping unit and are perpendicular to the embedded steel plates, the foundation grooves penetrate out of the upper surface of the cement foundation of the pumping unit from the cement foundation of the pumping unit, the foundation grooves are divided into upper parts and lower parts by the embedded steel plates, and the foundation grooves comprise upper foundation grooves located between the upper surface of the cement foundation of the pumping unit and the embedded steel plates and lower foundation grooves below the embedded steel plates. The bolt holes penetrate through the embedded steel plates, and are communicated with the upper foundation grooves and the lower foundation grooves. According to the base connecting structure, potential safety hazards in the turnover pumping and hoisting process are avoided.